You have to learn more about how to determine support and resistance area by use price pattern and some indicator. If you understand already how to do that so you will know which level price to buy and what is the stop loss level. Different between stop loss and take profit should 1:2 , for example if stop loss 5% so the take profit should be minimum 10%.
Actually, there is really a lot to learn when it comes to trading, but the problem is people are not always patient to learn all they need to learn before even starting to trade but since they heard you can make a lot of money from trading, they just want to start making money immediately, and it is because of this that a larger percentage of traders are always losing most of the time.
Trading can be fun, only when you have the knowledge and experience to be able to trade and you cannot just get all those in one day which is why I always advise wannabe traders that if they want to do well, they should not rush, but start with paper trading or demo trading, so they can at least build on themselves.